Personally I think she is faking. 1 The timing is too convenient, she would have gotten PG at the same time as Liz or even before right?2 She is too happy about it. Anyone as selfish as her wouldn't be this happy about it would she?3 Her obviousness at speaking to the doctor (sans clinic report confirming the PG)

I just think she faking in order to put pressure on Lucky and make Liz upset enough to divorce him! :0